Parentheses (circle brackets) support in formulas?

Is there any way to use parentheses in formula? Like "begin group"/"end group" checkboxes in ORK1.The only info I found so far - I MUST split my big formula into several small ones.But this is not a comfotable way for me, I used to use mathematic representation. And absense of "begin group"/"end group" looks like a downgrade to me.Am I miss something?